<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>权限管理</el-breadcrumb-item>
			<el-breadcrumb-item>角色列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图 -->
		<el-card>
			<!-- 添加角色按钮区域 -->
			<el-row>
				<el-col>
					<el-button type="primary" @click="addRolesDialogVisible = true">添加角色</el-button>
				</el-col>
			</el-row>
			<!-- 添加角色对话框 -->
			<el-dialog
				title="添加角色"
				:visible.sync="addRolesDialogVisible"
				width="50%"
				@close="addRolesDialogClosed"
			>
				<!-- 内容主体区域 -->
				<el-form
					:model="addRolesForm"
					:rules="addRolesFormRules"
					ref="addRolesFormRef"
					label-width="70px"
				>
					<el-form-item label="角色名称:" label-width="100px" prop="roleName">
						<el-input v-model="addRolesForm.roleName"></el-input>
					</el-form-item>
					<el-form-item label="角色描述:" label-width="100px" prop="roleDesc">
						<el-input v-model="addRolesForm.roleDesc"></el-input>
					</el-form-item>
				</el-form>
				<!-- 底部区域 -->
				<span slot="footer" class="dialog-footer">
					<el-button @click="addRolesDialogVisible = false">取 消</el-button>
					<el-button type="primary" @click="addRole">确 定</el-button>
				</span>
			</el-dialog>

			<!-- 角色列表区域 -->
			<el-table :data="rolelist" border stripe>
				<!-- 展开列 -->
				<el-table-column type="expand">
					<template slot-scope="scope">
						<el-row :class="['bdbottom', i1 === 0? 'bdtop':'', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
							<!-- 渲染一级权限 -->
							<el-col :span="5">
								<el-tag closable @close="removeRightsById(scope.row, item1.id)">{{item1.authName}}</el-tag>
								<i class="el-icon-caret-right"></i>
							</el-col>
							<!-- 渲染二级和三级权限 -->
							<el-col :span="19">	
								<el-row :class="[i2 === 0? '':'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
									<!-- 渲染二级权限 -->
									<el-col :span="6">
										<el-tag type="success" closable @close="removeRightsById(scope.row, item2.id)">{{item2.authName}}</el-tag>
										<i class="el-icon-caret-right"></i>
									</el-col>
									<!-- 渲染三级权限 -->
									<el-col :span="18">
										<el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightsById(scope.row, item3.id)">
											{{item3.authName}}
										</el-tag>
									</el-col>
								</el-row>
							</el-col>
						</el-row>
					</template>
				</el-table-column>

				<el-table-column type="index" label="序号" width="100px"></el-table-column>
				<el-table-column label="角色名称" prop="roleName"></el-table-column>
				<el-table-column label="角色描述" prop="roleDesc"></el-table-column>
				<el-table-column label="操作">
					<template slot-scope="scope">
						<el-button
							size="mini"
							type="primary"
							icon="el-icon-edit"
							@click="showEditRolesDialog(scope.row.id)"
						>
							编辑
						</el-button>
						<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
						<el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
					</template>
				</el-table-column>
			</el-table>

			<!-- 修改列表对话框 -->
			<el-dialog
				title="修改角色"
				:visible.sync="editRolesDialogVisible"
				width="50%"
				@close="editRolesDialogClosed"
			>
				<!-- 内容主体区域 -->
				<el-form
					:model="editRolesForm"
					:rules="editRolesFormRules"
					ref="editRolesFormRef"
					label-width="70px"
				>
					<el-form-item label="角色名称:" label-width="100px" prop="roleName">
						<el-input v-model="editRolesForm.roleName"></el-input>
					</el-form-item>
					<el-form-item label="角色描述:" label-width="100px" prop="roleDesc">
						<el-input v-model="editRolesForm.roleDesc"></el-input>
					</el-form-item>
				</el-form>
				<!-- 底部区域 -->
				<span slot="footer" class="dialog-footer">
					<el-button @click="editRolesDialogVisible = false">取 消</el-button>
					<el-button type="primary" @click="editRoleInfo()">确 定</el-button>
				</span>
			</el-dialog>

			<!-- 分配权限对话框 -->
			<el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
				<!-- 树形控件 -->
				<el-tree show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" :data="rightslist" :props="treeProps" ref="treeRef"></el-tree>

				<span slot="footer" class="dialog-footer">
					<el-button @click="setRightDialogVisible=false">取消</el-button>
					<el-button type="primary" @click="allotRights">确定</el-button>
				</span>
			</el-dialog>
		</el-card>
	</div>
</template>

<script>
export default {
	data() {
		return {
			// 所有角色列表数据
			rolelist: [],
			// 所有权限数据
			rightslist: [],
			// 树形控件的属性绑定对象
			treeProps: {
				label: 'authName',
				children: 'children'
			},
			// 默认选中的节点ID值数组
			defKeys:[],
			// 当前即将分配权限的角色的id
			roleId: '',
			// 控制添加角色对话框的显示与隐藏
			addRolesDialogVisible: false,
			// 控制修改角色对话框的显示与隐藏
			editRolesDialogVisible: false,
			// 控制分配权限对话框的显示与隐藏
			setRightDialogVisible: false,
			// 添加角色的表单
			addRolesForm: {
				roleName: '',
				roleDesc: ''
			},
			// 添加角色的验证规则对象
			addRolesFormRules: {
				roleName: [{ required: true, message: '请输入角色名称', trigger: 'blur' }],
				roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
			},
			// 修改角色的表单
			editRolesForm: {},
			// 修改角色的验证规则对象
			editRolesFormRules: {
				roleName: [{ required: true, message: '请输入角色名称', trigger: 'blur' }],
				roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
			}
		};
	},

	// 声明周期函数
	created() {
		this.getRolesList();
	},

	methods: {
		// 获取所有角色的列表
		async getRolesList() {
			const { data: res } = await this.$http.get('roles');

			if (res.meta.status !== 200) {
				return this.$message.error('获取角色列表失败！');
			}
			this.rolelist = res.data;
		},

		//点击确定按钮添加新角色
		addRole() {
			this.$refs.addRolesFormRef.validate(async valid => {
				if (!valid) return;
				// 校验成功则可以发起添加用户的网络请求
				const { data: res } = await this.$http.post('roles', this.addRolesForm);
				if (res.meta.status !== 201) {
					this.$message.error('添加角色失败!');
				}
				this.$message.success('添加角色成功！');
				// 隐藏添加角色的对话框
				this.addRolesDialogVisible = false;
				// 重新获取角色列表数据
				this.getRolesList();
			});
		},

		// 监听添加角色对话框的关闭时间
		addRolesDialogClosed() {
			this.$refs.addRolesFormRef.resetFields();
		},

		// 点击弹出修改角色的对话框
		async showEditRolesDialog(id) {
			const { data: res } = await this.$http.get('roles/' + id);
			if (res.meta.status !== 200) {
				return this.$message.error('查询用户信息失败!');
			}
			this.editRolesForm = res.data;
			this.editRolesDialogVisible = true;
		},

		// 监听修改角色对话框的关闭时间
		editRolesDialogClosed() {
			this.$refs.editRolesFormRef.resetFields();
		},

		// 监听分配权限对话框的关闭时间
		setRightDialogClosed() {
			this.defKeys = [];
		},

		// 修改角色信息并提交
		editRoleInfo() {
			this.$refs.editRolesFormRef.validate(async valid => {
				if (!valid) return;
				// 发起修改用户信息的数据请求
				const { data: res } = await this.$http.put('roles/' + this.editRolesForm.roleId, {
					roleName: this.editRolesForm.roleName,
					roleDesc: this.editRolesForm.roleDesc
				});
				if (res.meta.status !== 200) {
					return this.$message.error('修改角色信息失败！');
				}
				// 关闭对话框
				this.editRolesDialogVisible = false;
				// 刷新数据列表
				this.getRolesList();
				// 提示修改成功
				this.$message.success('修改角色信息成功！');
			});
		},

        //通过ID删除角色信息
		async removeRoleById(id) {
			// 弹框询问是否删除
			const confirmResult =  await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).catch(err => err);
			// 如果用户确认删除，则返回值为字符串‘confirm’
			// 如果用户取消了删除，则返回值为字符串‘cancel’
			if(confirmResult !== 'confirm') {
				return this.$message.info('已取消了删除');
			}
			const {data: res} = await this.$http.delete('roles/' + id);
			if(res.meta.status !== 200) {
				return this.$message.error('删除角色信息失败！');
			}
			this.$message.success('删除角色信息成功!');
			this.getRolesList();
		},

		// 通过ID删除权限信息
		async removeRightsById(role, rightId) {
			// 弹框提示用户是否要删除
			const confirmResult =  await this.$confirm('此操作将永久删除该权限，是否继续？', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).catch(err => err);
			// 如果用户确认删除，则返回值为字符串‘confirm’
			// 如果用户取消了删除，则返回值为字符串‘cancel’
			if(confirmResult !== 'confirm') {
				return this.$message.info('已取消了删除');
			}
			const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
			if(res.meta.status !== 200) {
				return this.$message.error('删除权限信息失败！');
			}
			this.$message.success('删除权限信息成功!');
			// this.getRolesList(); //这种方法会使整个列表刷新，不利于用户体验
			role.children = res.data; //这种方法只会刷新用户的权限信息，不会渲染整个页面
		},

		// 展示分配权限的对话框
		async showSetRightDialog(role) {
			this.roleId = role.id;
			// 获取所有权限数据
			const {data: res} =  await this.$http.get('rights/tree');
			if(res.meta.status !== 200) {
				return this.$message.error('获取权限数据失败!');
			}
			// 获取到的权限数据保存到data中
			this.rightslist = res.data;
			// 递归获取三级节点的id
			this.getLeafKeys(role, this.defKeys);

			this.setRightDialogVisible = true;
		},

		// 通过递归的形式，获取角色夏所有三级权限的id，并保存到 defKeys 数组中
		getLeafKeys(node, arr) {
			// 如果当前node节点不包含children属性，则是三级节点
			if(!node.children) {
				return arr.push(node.id);
			}
			node.children.forEach(item => {
				this.getLeafKeys(item, arr);
			});
		},

		// 点击为角色分配权限
		async allotRights() {
			const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()];
			const idStr = keys.join(',');
			const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr});
			if(res.meta.status !== 200) {
				this.$message.error('分配权限失败！');
			}
			this.$message.success('分配权限成功！');
			this.getRolesList();
			this.setRightDialogVisible = false;
		}
	}
};
</script>

<style lang="less" scoped>
.el-tag {
	margin: 20px;
	font-size: 14px;
}

.bdbottom {
	border-bottom: 2px solid #eee;
}
.bdtop {
	border-top: 2px solid #eee;
}

.vcenter {
	display: flex;
	align-items: center;
}
</style>